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        1. (1)NMBĴС (2)AĞ70.l׃.NMBǶٶ?ĽY(ji)ɵõһ(g)Y(ji)Փ:һĴֱƽ־c߅߅L(zhng)ཻɵĽǵ픽ǵһ .Ո(qng)A=a.Ա}CY(ji)Փ.}10 D.Dǵ߅ABC(ni)һc(din).AD=BD.DBP=DBC.BP=BA.PĶȔ(sh)

           

          }Ŀб(𰸺ͽ)

          ڡABCAB=ACABĴֱƽ־ABNBCL(zhng)MA=30NMBĴС
          еġAĶȔ(sh)Ğ70l׃NMBĴС
          еʲôӵҎ(gu)ԇCՈ(qng)ͬW(xu)ԼD
          ܌еġAĞg(du)@(g)}Ҏ(gu)ԵJ(rn)R(sh)ǷҪ޸

          鿴𰸺ͽ>>

          ڡABCУAB=ACABĴֱƽ־ABNBCL(zhng)MA=30NMBĴ
          еġAĶȔ(sh)Ğ70l׃NMBĴ
          еʲôӵҎ(gu)ԇCՈ(qng)ͬW(xu)ԼD
          ܌еġAĞg(du)@(g)}Ҏ(gu)ԵJ(rn)R(sh)ǷҪ޸

          鿴𰸺ͽ>>

          ڡABCAB=ACABĴֱƽ־ABNBCL(zhng)MA=30°NMBĴ
          еġAĶȔ(sh)Ğ70°l׃NMBĴ
          еʲôӵҎ(gu)ԇCՈ(qng)ͬW(xu)ԼD
          ܌еġAĞg(du)@(g)}Ҏ(gu)ԵJ(rn)R(sh)ǷҪ޸

          鿴𰸺ͽ>>

          ڡABCAB=ACABĴֱƽ־ABNBCL(zhng)MA=30°NMBĴ
          еġAĶȔ(sh)Ğ70°l׃NMBĴС
          еʲôӵҎ(gu)ԇCՈ(qng)ͬW(xu)ԼD
          ܌еġAĞgǣ(du)@(g)}Ҏ(gu)ԵJ(rn)R(sh)ǷҪ޸

          鿴𰸺ͽ>>

          DڡABCAB=ACABĴֱƽ־ABNֱBCc(din)M
          1D1A=40NMBĴ
          2D21СAĶȔ(sh)Ğ70l׃NMBĴ
          3l(f)F(xin)ʲôҎ(gu)벢C

          鿴𰸺ͽ>>


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